docs: def repeater(self, value):
          """
          Define the repeater of the current chain part.
  
          :param value:
          :type value:
          :return:
          :rtype:
          """
          try:
              value = int(value)
              self.repeater_start = value
              self.repeater_end = value
              return self
          except ValueError:
              pass
          if value == '+':
              self.repeater_start = 1
              self.repeater_end = None
          if value == '*':
              self.repeater_start = 0
              self.repeater_end = None
          elif value == '?':
              self.repeater_start = 0
              self.repeater_end = 1
          else:
              match = re.match(r'\{\s*(\d*)\s*,?\s*(\d*)\s*\}', value)
              if match:
                  start = match.group(1)
                  end = match.group(2)
                  if start or end:
                      self.repeater_start = int(start) if start else 0
                      self.repeater_end = int(end) if end else None
          return self